The fill factor of a solar cell

Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
1 reply · 2K views
patric44
Messages
308
Reaction score
40
Homework Statement
a question about the fill factor of a solar cell
Relevant Equations
FF = Vm*Im/Voc*Isc
hi guys
for a solar cell i know that the fill factor is given by the following relation :
$$ FF = \frac{Vm*Im}{Voc*Isc}$$
but when solving the following example :
cell.png

the book used the following relation in the problem?! :
FF.png

where this Ln relation came from ?
 
Physics news on Phys.org
any help on this , i just want a hint how to derive it